Device for reducing the pitching of ships



Sept. 13, 1927.

H. F. w. LUCKE DEVICE FOR REDUCING THE PITCHING 0F SHIPS Filed Nov. 9.1926 Fi Z.

e m W T y. NM

Patented Sept. 13,1927.

UNITED sTATEs PATENT OFFICE.

DEVICE. FOR REDUCING THE IITCHIN G OF SHIPS.

Application filed November 9, 1926, Serial No. 147,211, and in GermanyJuly 29, 1926.

This invention relates to a device for reducing the pitching of shipsand has for 1ts object to reduce pitching, especially 1n the case ofships travelling under ballast, 1n such a manner that the annoyingmovement of the propeller out of the water is eliminated during pitchingand an idle runnlng of the propeller is obviated.

Endeavours have been made to overcome this drawback by various means butas the means employed were mostly too complicated or did not fulfilltheir purpose, they were abandoned.

For example rotary plates have been arranged outside the hull of theship, these plates being adapted to be brought into their operativeposition by an extremely complicated device.

According to the present invention guide members are arranged on bothsides of the rear stem of the vessel, these members extending close upto the propeller blades. In order to enable a balance of the suctionaction above and below the guide members to be obtained more easily, theguide members are provided with openings located near the hull of theship. For the purpose of removing the load of surface pressure furtheropenings of suitable shape are provided.

In the accompanyin trated two examples of subject of the invention.

Figure 1 is an elevation of the rear stem of a ship with a guide memberconsisting of a plate.

Figure 2 is an elevation of the rear stem with a guide body composed ofa number of plates fitted together in the form of a hollow body.

Figure 3 is a plan of the rear stem.

drawing are illusconstruction of the Figure 4 is a plan of a guidemember consisting of a plate.

Figure 5 is a view of the interior of a guide member composed of anumber of plates, and

Figure 6 is a section on-the line AB of Figure 5.

t the rear stem of the ship stationary guide members a are provided oneach side thereof. The guide members may be composed of single plates orof a number of plates in which latter case the plates are fittedtogether so as to form a hollow body. The guide members a are of such ashape that they extend as close as possible to the propeller blades 6.In order to obtain a satisfactory balance of the suction above and belowthe guide members at these latter are provided with openings 0 which arearranged near the hull of the ship. In order to remove the load ofsurface ressure the guide members are also provided with openin 's Ii.providing such guide members the pitching of the ship, even whentravelling under ballast, is considerably reduced as the guide membersoppose a considerable resistance to pitching.

Having thus described my invention what I claim as new and desire tosecure by Letters Patent is A device for reducing the pitching of ships,wherein stationary guide members are provided on both sides of the rearof the s ip and extend close up to the propeller blades and wherein theguide members consist each of a number of plates which are formed into ahollow body.

In testimony whereof I have afiixed my.

signature.

HERMANN FRIEDRICH WILHELM LUCKE.

